Timing of the Arabia-Eurasia continental collision—Evidence from detrital zircon U-Pb geochronology of the Red Bed Series strata of the northwest Zagros hinterland, Kurdistan region of Iraq: REPLY

Koshnaw, Renas I.; Stöckli, Daniel F.; Schlunegger, Fritz

doi:10.1130/g46438y.1

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Arabia first collided with Eurasia in the western MZT at the Eocene/Oligocene boundary, and the collision then propagated eastwards. This paleogeographic reconstruction for Arabia-Eurasia assembly is in general agreement with estimates based on collisional deformation (e.g., Barber et al, 2018;Homke et al, 2009) and observations of the foreland-basin sedimentation pattern (e.g., Cai et al, 2021;Koshnaw et al, 2019). Our paleomagnetic data, as well as the previous Eocene-Miocene paleomagnetic declinations of the Central Iran block (Mattei et al, 2012), suggest a clockwise rotation of the Iran block since the Eocene, consistent with the diachronous collision model (Figure 1a).…”

Section: Discussionsupporting

confidence: 90%

“…The plate kinematic reconstructions and presence of Eurasian detritus in the Arabian foreland basin is direct evidence that can constrain the continent-continent collision age (e.g., Cai et al, 2021;Ding et al, 2017;GholamiZadeh et al, 2021;Koshnaw et al, 2019;. Eocene-Miocene paleomagnetic data from the deformed Iran orogen are required to place the orogen within the context of the global plate circuit.…”

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confidence: 99%

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Paleomagnetism From Central Iran Reveals Arabia‐Eurasia Collision Onset at the Eocene/Oligocene Boundary

Song

Ding

Zhang

et al. 2023

Geophysical Research Letters

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

Paleomagnetism From Central Iran Reveals Arabia‐Eurasia Collision Onset at the Eocene/Oligocene Boundary

Song

Ding

Zhang

et al. 2023

Geophysical Research Letters

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“…Magmatism was related to the subduction of the Neotethyan oceanic crust beneath Iran from Cretaceous to Oligocene and then due to the collision between Arabia and Iran beginning at ~25 Ma (McQuarrie & van Hinsbergen, 2013). There are several lines of evidence suggesting that Arabia‐Iran collision began ~25 Ma ago, during the late Oligocene (Barber et al, 2018; Koshnaw et al, 2017; Koshnaw et al, 2019; McQuarrie & van Hinsbergen, 2013). The collision led to core complex exhumation and melting of Iranian crust (Moghadam, Rossetti, et al, 2016; Stockli, 2004).…”

Section: Introductionmentioning

confidence: 99%

Neotethyan Subduction Ignited the Iran Arc and Backarc Differently

Moghadam

et al. 2020

JGR Solid Earth

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Most arcs show systematic temporal and spatial variations in magmatism with clear shifts in igneous rock compositions between those of the magmatic front (MF) and those in the backarc (BA). It is unclear if similar magmatic polarity is seen for extensional continental arcs. Herein, we use geochemical and isotopic characteristics coupled with zircon U‐Pb geochronology to identify the different magmatic style of the Iran convergent margin, an extensional system that evolved over 100 Myr. Our new and compiled U‐Pb ages indicate that major magmatic episodes for the NE Iran BA occurred at 110–80, 75–50, 50–35, 35–20, and 15–10 Ma. In contrast to NE Iran BA magmatic episodes, compiled data from MF display two main magmatic episodes at 95–75 and 55–5 Ma, indicating more continuous magmatism for the MF than for the BA. We show that Paleogene Iran serves as a useful example of a continental arc under extension. Our data also suggest that there is not a clear relationship between the subduction velocity of Neotethyan Ocean beneath Iran and magmatic activity in Iran. Our results imply that the isotopic compositions of Iran BA igneous rocks do not directly correspond to the changes in tectonic processes or geodynamics, but other parameters such as the composition of lithosphere and melt source(s) should be considered. In addition, changes in subduction zone dynamics and contractional versus extensional tectonic regimes influenced the composition of MF and BA magmatic rocks. These controls diminished the geochemical and isotopic variations between the magmatic front and backarc.

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“…The Zagros Fold-Thrust Belt extends for c. 2000 km from the Hormuz Strait in southern Iran NW-ward to the Kurdistan Region of Iraq and SE Turkey (Agard et al, 2011;Berberian, 1995;Mouthereau et al, 2012). It results from the convergence and subsequent continent-continent collision between the Arabian and Eurasian plates during Oligocene-Early Miocene following the obduction of the ophiolite sequences on Arabia's margin in the Late Cretaceous and the subduction of the Neotethys oceanic crust beneath the Eurasia Plate (Agard et al, 2011;Khadivi et al, 2012;Koshnaw et al, 2018;Mouthereau et al, 2012). Since the onset of collision, the deformation front has propagated 250-350 km SW-ward during the Neogene, involving the northeastern margin of the Arabian Plate into a largely NW-SE-trending foreland fold-thrust belt (Agard et al, 2011;Mouthereau, 2011;Mouthereau et al, 2007).…”

Section: Geological Backgroundmentioning

confidence: 99%

Late Pleistocene‐Holocene Slip Rates in the Northwestern Zagros Mountains (Kurdistan Region of Iraq) Derived From Luminescence Dating of River Terraces and Structural Modeling

Zebari

Preusser

Grützner³

et al. 2021

Tectonics

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A significant amount of the ongoing shortening between the Eurasian and Arabian plates is accommodated within the Zagros Fold‐Thrust Belt. However, the spatial and temporal distribution of active shortening within the belt, especially in its NW part, is not yet well constrained. We determined depositional ages of uplifted river terraces crossing the belt along the Greater Zab River using luminescence dating. Kinematic modeling of the fault‐related fold belt was then used to calculate long‐term slip rates during the Late Pleistocene to Holocene. Our results provide new insight into the rates of active faulting and folding in the area. The Zagros Mountain Front Fault accommodates about 1.46 ± 0.60 mm a−1 of slip, while a more external basement fault further to the SW accommodates less than 0.41 ± 0.16 mm a−1. Horizontal slip rates related to detachment folding of two anticlines within the Zagros Foothills are 0.40 ± 0.10 and 1.24 ± 0.36 mm a−1. Basement thrusting and thickening of the crust are restricted to the NE part of the Zagros belt. This is also reflected in the regional topography and in the distribution of uplifted terraces. In the southwestern part, the deformation is limited mainly to folding and thrusting of the sedimentary cover above a Triassic basal detachment. In the NE, deformation is associated with slip on basement thrusts. Our study sheds light on the distribution of shortening in the Zagros Mountains and helps to understand the regional tectonic system. Our results may be the foundation for a better seismic hazard assessment of the entire area.

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Timing of the Arabia-Eurasia continental collision—Evidence from detrital zircon U-Pb geochronology of the Red Bed Series strata of the northwest Zagros hinterland, Kurdistan region of Iraq: REPLY

Cited by 5 publications

References 7 publications

Paleomagnetism From Central Iran Reveals Arabia‐Eurasia Collision Onset at the Eocene/Oligocene Boundary

Paleomagnetism From Central Iran Reveals Arabia‐Eurasia Collision Onset at the Eocene/Oligocene Boundary

Neotethyan Subduction Ignited the Iran Arc and Backarc Differently

Late Pleistocene‐Holocene Slip Rates in the Northwestern Zagros Mountains (Kurdistan Region of Iraq) Derived From Luminescence Dating of River Terraces and Structural Modeling

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